搜索

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Co-Ga二元系的X射线研究

陆学善 梁敬魁 张道范

引用本文:
Citation:

Co-Ga二元系的X射线研究

陆学善, 梁敬魁, 张道范

AN X-RAY INVESTIGATION OF THE Co-Ga BINARY SYSTEM

LU XUE-SHAN, LIANG JING-KUI, ZHANG DAO-FAN
PDF
导出引用
  • 本文主要用X射线粉末衍射法,配合着差热分析,研究了Co-Ga二元系的平衡关系。这个系统在室温除Ga与γ-Co外,存在着α′,β和φ三个相。α′相是以面心立方为基的超结构相,可以看作是Ga溶于α-Co中,而使α-Co得在常温稳定存在的相。α′相在室温的均匀范围为2.4—10.7at.%Ga。β相于1177℃由α′+Lβ包晶反应所形成,是CsCI型结构,在常温的均匀范围为36.3—59.8at.%Ga。单相区内点阵常数随成份的变迁在47.5at.%Ga处有一最大值,这与Al-Ni二元系中的β相很相似,在这个最大值左边的富Co区域是替代式固溶体,而在最大值右边的富Ga区域,则是缺陷式固溶体。ψ相的均匀范围很窄,仅存在于75at.%Ga附近。它属于四方晶系,空间群为D4h14-P42/mnm,晶胞内含4个化合式量CoGa3,在20℃和75.4at.%Ga处的点阵常数为:a=6.2365?,c=6.4347?,c/a=1.0318。它是由包晶反应β+L←→ψ所形成的,反应温度为833℃。无论Ga在γ-Co中,或Co在Ga中都不存在可以观察得到的固溶度。从CoGa3到Ga,存在着一条27℃的共晶等温线,共晶点非常接近纯Ga。
    The Co-Ga binary system has been investigated by X-rays in conjunction with differential thermal analysis.It has been established that besides Ga and γ-Co which is the room temperature modification of pure cobalt, there are three phases in the entire system, α′,β and ψ. α′ is a superstructure phase based on a face-centred cubic fundamental lattice, and may be considered as a solid solution of α-Co which is the high temperature form of pure cobalt, stabilized at room temperature due to the addition of gallium. The homogeneous range of this phase at room temperature is 2.4-10.7 at % Ga. The β phase is formed by a peritectic reactio α+L ←→β at 1177℃, with a homogeneous range 36.3-59.8 at % Ga at room temperature. The structure of this phase is of the CsCl (B2) type. The lattice spacing changes with composition in such a way that it rises at first, reaches a maximum, and then falls off with the gallium content. This is similar to the β phase in the Al-Ni system. In the Co-rich side of the maximum, it appears as a substitutional type solid solution, while in the Ga-rich side, it belongs to the defect type, the addition of Ga atoms being equivalent to the dropping off of some Co atoms from the normal lattice. The homogeneous range of the ψ phase is extremely narrow, existing only at the near neighbourhood of the stoichiometric composition 75 at % Ga. This phase belongs to the tetragonal system with space group D4h14-P42/mnm. Bach unit cell contains four formula weights CoGa3, and the lattice spacings at 75.4 at % Ga and 20℃ are α=6.2365?, c=6.4347?, c/a = 1.0318. It is formed peritectically (α + L←→ψ)at 833℃.Neither Ga in γ-Co nor Co in Ga shows any detectable solid solubility. There exists an eutectic horizontal from CoGa3 to Ga at 27℃, with the eutectic point very close to pure gallium.
  • [1]
  • [1] 刘慧强, 任玉琦, 周光照, 和友, 薛艳玲, 肖体乔. 相移吸收二元性算法用于X射线混合衬度定量显微CT的可行性研究. 物理学报, 2012, 61(7): 078701. doi: 10.7498/aps.61.078701
    [2] 潘毓英, 郑建宣, 李明, 杨华. Gd-Ni二元系合金相图. 物理学报, 1986, 35(5): 677-680. doi: 10.7498/aps.35.677
    [3] 王超英, 傅正民, 陈立泉. LiNaSO4-MgSO4赝二元系中离子导体的研究. 物理学报, 1986, 35(5): 691-696. doi: 10.7498/aps.35.691
    [4] 王文采, 葛森林, 陈玉. 非晶态As-Se二元系短程结构的EXAFS研究. 物理学报, 1986, 35(9): 1164-1171. doi: 10.7498/aps.35.1164
    [5] 潘毓英, 郑建宣. Nd-Ni二元系合金相图. 物理学报, 1985, 34(3): 384-389. doi: 10.7498/aps.34.384
    [6] 刘敬旗, 郑建宣. Gd-Sn二元系合金相图. 物理学报, 1984, 33(8): 1155-1159. doi: 10.7498/aps.33.1155
    [7] 傅正民, 李文秀, 徐盘祥, 詹静子, 祁小贞. Ba2CaWO6-Sr2CaWO6赝二元系的研究. 物理学报, 1984, 33(10): 1427-1433. doi: 10.7498/aps.33.1427
    [8] 陈荣贞, 郑建宣. Dy-Sn二元系合金相图. 物理学报, 1983, 32(7): 933-938. doi: 10.7498/aps.32.933
    [9] 郑建宣, 曾令民. Gd-Cu二元系合金相图. 物理学报, 1983, 32(11): 1443-1448. doi: 10.7498/aps.32.1443
    [10] 潘毓英, 郑建宣. Sm-Ni二元系合金相图. 物理学报, 1983, 32(1): 92-95. doi: 10.7498/aps.32.92
    [11] 郑建宣, 农亮勤. Nd-Cu二元系合金相图. 物理学报, 1983, 32(11): 1449-1454. doi: 10.7498/aps.32.1449
    [12] 郑建宣, 王淳正. Dy-Ni二元系合金相图. 物理学报, 1982, 31(5): 668-673. doi: 10.7498/aps.31.668
    [13] 郑建宣, 徐国雄. Dy-Cu二元系合金相图. 物理学报, 1982, 31(6): 807-809. doi: 10.7498/aps.31.807
    [14] 庄应烘, 袁世田, 郑建宣. 钆-铟二元系合金相图. 物理学报, 1982, 31(1): 121-125. doi: 10.7498/aps.31.121
    [15] 陆学善, 解思深, 梁敬魁. La—Ga二元系相图. 物理学报, 1982, 31(12): 55-61. doi: 10.7498/aps.31.55
    [16] 唐棣生, 傅正民, 李文秀. LiIO3-Zn(IO3)2 赝二元系的研究. 物理学报, 1981, 30(2): 234-241. doi: 10.7498/aps.30.234
    [17] 唐棣生, 车广灿, 田静华. 碱金属碘酸盐赝二元系固溶体的研究. 物理学报, 1980, 29(8): 1068-1074. doi: 10.7498/aps.29.1068
    [18] 唐棣生, 车广灿, 陈立泉. Li4GeO4-Zn2GeO4赝二元系相图的研究. 物理学报, 1980, 29(11): 1497-1502. doi: 10.7498/aps.29.1497
    [19] 陆学善, 梁敬魁, 石庭俊, 周敏强. Mn-Ga二元系的X射线研究. 物理学报, 1980, 29(4): 469-484. doi: 10.7498/aps.29.469
    [20] 陆学善, 梁敬魁, 王晓堂. Fe-Ga二元系平衡图. 物理学报, 1966, 22(4): 429-439. doi: 10.7498/aps.22.429
计量
  • 文章访问数:  5696
  • PDF下载量:  539
  • 被引次数: 0
出版历程
  • 收稿日期:  1979-02-28
  • 刊出日期:  2005-07-29

/

返回文章
返回